new blooms database (#8712)

* new blooms database

* fixed conflict in Cargo.lock

* removed bloomchain

* cleanup in progress

* all tests passing in trace db with new blooms-db

* added trace_blooms to BlockChainDB interface, fixed db flushing

* BlockChainDB no longer exposes RwLock in the interface

* automatically flush blooms-db after every insert

* blooms-db uses io::BufReader to read files, wrap blooms-db into Mutex, cause fs::File is just a shared file handle

* fix json_tests

* blooms-db can filter multiple possibilities at the same time

* removed enum trace/db.rs CacheId

* lint fixes

* fixed tests

* kvdb-rocksdb uses fs-swap crate

* update Cargo.lock

* use fs::rename

* fixed failing test on linux

* fix tests

* use fs_swap

* fixed failing test on linux

* cleanup after swap

* fix tests

* fixed osx permissions

* simplify parity database opening functions

* added migration to blooms-db

* address @niklasad1 grumbles

* fix license and authors field of blooms-db Cargo.toml

* restore blooms-db after snapshot

ethcore/sync/src/tests/helpers.rs

@@ -29,6 +29,7 @@ use ethcore::snapshot::SnapshotService;
 use ethcore::spec::Spec;
 use ethcore::account_provider::AccountProvider;
 use ethcore::miner::Miner;
+use ethcore::test_helpers;
 use sync_io::SyncIo;
 use io::{IoChannel, IoContext, IoHandler};
 use api::WARP_SYNC_PROTOCOL_ID;
@@ -384,7 +385,7 @@ impl TestNet<EthPeer<EthcoreClient>> {
 		let client = EthcoreClient::new(
 			ClientConfig::default(),
 			&spec,
-			Arc::new(::kvdb_memorydb::create(::ethcore::db::NUM_COLUMNS.unwrap_or(0))),
+			test_helpers::new_db(),
 			miner.clone(),
 			channel.clone()
 		).unwrap();